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I am in the same boat...
I filed my I-140 in March, 2003. From the beginning, BCIS on-line enquiry as well as phone enquiry says that they cannot find my receipt. Moreover I never got a receipt also...The only proof that I have a receipt number is my cashed-in check which has the number on the back....
I contacted BCIS, spoke to their customer representatives atleast 4 times...till now, no change....